Benzenesulfonyl-ureas and process for their manufacture

ABSTRACT

HYPOGLYCEMICALLY ACTIVE BENZENESULFONYL-UREAS OF THE FORMULA   (X-QUINOLIN-8-YL)-CO-NH-Y-(2-Z-1,4-PHENYLENE)-SO2-NH-CO-   NH-R   WHEREIN X IS HYDROGEN, CHLORINE, BROMINE, METHOXY OR METHYL, Y IS -CH(CH3)-CH2-, -CH2-CH(CH3)OR -CH2CH2-, R IS ALKYL OF 3 TO 6 CARBON ATOMS, CYCLOALKYL OF 5 TO 8 CARBON ATOMS, WHICH MAY BE SUBSTITUTED BY 1 OR 2 ALKYL OF UP TO 3 CARBON ATOMS OR BY CHLORINE, CYCLOALKENYL OF 5 TO 8 CARBON ATOMS, WHICH MAY BE SUBSTITUTED BY 1 TO 2 ALKYL OF UP TO 3 CARBON ATOMS, BICYCLOALKYL OR BICYCLOALKENYL OF 7 OR 8 CARBON ATOMS, NORTRICYCLYL, SPIRO(2,4)-HEPTYL, Z IS HYDROGEN OR A HYDROCARBON RADICAL OF 1 OR 2 CARBON ATOMS WHICH FORMS WITH Y A 5- OR 6-MEMBERED RING, OR THE SALTS THEREOF AS WELL AS A PROCESS FOR THEIR MANUFACTURE.

United States Patent 3,751,418 BENZENESULFONYL-UREAS AND PROCESS FOR THEIR MANUFACTURE Rudi Weyer, Frankfurt am Main, Walter Aumuller, Kelkheirn, Taunus, Helmut Weber, Frankfurt am Main, Roland Schweitzer, Falkenstein, Taunus, and Ruth Heerdt, Mannheim, Germany, assignors to Farbwerke Hoechst Aktiengesellschaft vormals Meister Lucius &

Bruning, Frankfurt am Main, Germany Filed June 3, 1971, Ser. No. 149,745 Claims priority, application Germany, June 6, 1970, P 20 27 950.9 Int. Cl. C07c 33/48 US. Cl. 260-283 SA 7 Claims ABSTRACT OF THE DISCLOSURE Hypoglycemically active benzenesulfonyl-ureas of the formula wherein X is hydrogen, chlorine, bromine, methoxy or methyl, Y is CH(CH )CH -CH2CH(CH or CH CH R is alkyl of 3 to 6 carbon atoms, cycloalkyl of 5 to 8 carbon atoms, which may be substituted by 1 or 2 alkyl of up to 3 carbon atoms or by chlorine, cycloalkenyl of 5 to 8 carbon atoms, which may be substituted by 1 to 2 alkyl of up to 3 carbon atoms, bicycloalkyl or bicycloalkenyl of 7 or 8 carbon atoms, nortricyclyl, spir0[2,4]-heptyl, Z is hydrogen or a hydrocarbon radical of 1 or 2 carbon atoms which forms with Y a 5- or 6-membered ring, or the salts thereof as well as a process for their manufacture.

in which X represents hydrogen, chlorine, bromine, methoxy or methyl,

Y represents CH(CH )CH -CH CH(CH or, preferably, CH CH R represents (a) alkyl having 3 to 6 carbon atoms,

(b) cycloalkyl having 5 to 8 carbon atoms, which may be optionally substituted by 1 or 2 alkyl groups of up to 3 carbon atoms in total, or by chlorine,

(c) cycloalkenyl having 5 to 8 carbon atoms, which may optionally be substiuted by 1 or 2 alkyl groups of up to 3 carbon atoms in total,

(d) bicycloalkyl or bicycloalkenyl having 7 or 8 carbon atoms,

(e) nortricyclyl,

(f) spiro[2,4]-heptyl,

Z represents hydrogen or a hydrocarbon radical of 1 or 2 carbon atoms which forms with Y a 5- or 6-membered ring.

According to the above definitions R may, for example, stand for 3-ethylcyclopentyl, methyl-cyclopentyl, dimethyl-cyclopentyl, 4-methyl-cyclohexyl, 4-propyl-cyclohexyl, cyclopentenyl, cyclohexenyl, cycloheptenyl, 4-chloro-cyclohexyl, 4,4-dimethylcyclohexyl, 3-methyl-cyclopentenyl, 4-methyl-cyclohexenyl, endoalkylene-cyclohexyl, endoalkylene-cyclohexenyl, bicyclo(2.2.1) hept-2-en-7-yl, 2,6- endomethylene-cycloheptyl, 4,4-dimethyl-cyclohexen-Z-yl, 2-chlorocyclopentyl, 7-norcananyl or spiro[2,4]-heptyl.

The compounds of the above formula have, in substance or in the form of their salts, a hypoglycemic action which is strong and long lasting.

The present invention also provides a process for the manufacture of these benzenesulfonyl-ureas, which comprises (a) reacting benzenesulfonyl-isocyanates, benzenesulfonyl-carbamic acid esters, benzenesulfonyl-thiolcarbarnic acid esters, benzenesulfonyl-ureas, benzenesulfonyl-semicarbazides or benzenesulfonyl-semicarbazones which are substituted in 4-position by the group with an amine RNH or salts thereof, or reacting sulfonarnides of the formula or salts thereof with R-substituted isocyanates, carbamic acid esters, thiolcarbamic acid esters, carbamic acid halidesor ureas;

(b) Saponifying or hydrolyzing correspondingly substituted benzenesulfonyl-isourea ethers, benzenesulfonylisourea esters, benzenesulfonyl-isothiourea ethers, benzenesulfonyl-parabanic acids or benzenesulfonyl-haloformic acid amidines or compounds of the formula by acylation, optionally in one or more steps, into benzenesulfonyl-ureas of the formula (f) Reacting correspondingly substituted benzenesulfonyl-halides with R-substituted ureas or alkali metal salts thereof; or reacting correspondingly substituted benzenesulfinic acid halides or, in the presence of acid condensation agents, even correspondingly substituted sulfinic acids or alkali metal salts thereof with NR--N' hydroxy-urea;

And, where required, treating the reaction product so obtained with alkaline agents for salt formation.

The aforesaid benzenesulfonyl-carbamic acid esters or benzene-sulfonyl-thiolcarbamic acid esters may have in the alcoholic component an alkyl group or an aryl group or even a heterocyclic radical. Since this radical is split off during the reaction, its chemical constitution has no influence on the nature of the final product and may, therefore, be varied within wide limits. The same applies to N-R-substituted carbamic acid esters and the corresponding thiolcarbamic acid esters.

As carbamic acid halides, the chlorides are preferably used.

The benzenesulfonyl-ureas used as starting materials in the process of the present invention may be unsubstituted at the nitrogen atom of the urea molecule not joined to the sulfonyl group or may be monoor especially di-substituted. Since these substituents are split off during the reaction with the amines, their nature can be varied within wide limits. In addition to benzenesulfonyl-ureas which carry alkyl, aryl, acyl or heterocyclic substituents, there may also be used benzenesulfonyl-carbamoyl-irnidazoles and similar compounds or bis-(benzenesulfonyl)-ureas which may carry at one of the nitrogen atoms a further substituent, for example, a methyl group. For example, such bis-(benzenesulphonyl)-ureas or N-benzenesulfonyl- '-acyl-ureas may be treated with R-substituted amines and the salts so obtained may be heated to elevated temperatures, especially to a temperature above 100 C.

Furthermore, it is possible to start from R-substituted ureas or from R-substituted ureas which are monoor especially di-substituted at the free nitrogen atom and to react them with benzene-Z-sulfonamides carrying the substituent in 4-position. As such starting materials, there may be used for example N-cyclohexyl-urea, the corresponding N'-acetyl, N'-nitro, N'-cyclohexyl, N',N'-diphenyl (in which case the two phenyl radicals may also be substituted or be linked with each other either directly or by means of a bridge member such, for example, as CH -NH, -O or -S-), N'-methyl-N'-phenyl, N',N- dicyclohexyl-ureas as well as cyclohexyl-carbamoyl-imidazoles, -pyrazoles or -triazoles as well as compounds which carry, instead of cyclohexyl, another substituent within the range of the above definition for R.

The hydrolysis of the benzenesulfonyl-parabanic acids, benzenesulfonyl-isourea ethers, benzenesulfonyl-isothiourea ethers, benzenesulfonyl-isourea esters or bermenesulfonyl-haloformic acid amidines mentioned as starting substances is suitably carried out in an alkaline medium. Isourea ethers and isourea esters may also be hydrolysed successfully in an acid medium.

The replacement of thesulfur atom in the urea grouping of the corresponding substituted benzenesulfonyl-thioureas by an oxygen atom can be efiected in known manner, for example, with the aid of oxides or salts of heavy metals or with the use of oxidizing agents such, for example, as hydrogen peroxide, sodium peroxide, nitrous acid or permanganates.

The thioureas may also be desulfurized by treatment with phosgene or phosphorus pentachloride. The chloroformic acid amidines or carbodiimides obtained as intermediates may be converted into the benzenesulfonyl-ureas by suitable measures such, for example, as by saponification or addition of water.

As regards the reaction conditions, the variations of carrying out the process of the invention may, in general, be modified within wide limits and can be adapted to each individual case. For example, the reactions may be carried out with the use of solvents or without solvents, at room temperature or at an elevated temperature.

Depending on the nature of the starting substances, one or other of the aforesaid methods may, in some cases, provide a desired individual benzenesulfonyl-urea only in a small yield or may be inappropriate for its synthesis. In such comparatively rare cases, the expert will have no ditficulty in synthesizing the desired product according to one of the other methods of the process described.

The hypoglycemic action of the bensenesulfonyl-ureas of the invention can be ascertained by administering them to normally fed rabbits in the form of the sodium salts in a dose of 10 mg./kg. of body weight and determining the blood sugar level according to the known method of Hagedorn-Jensen or by means of an auto-analyzer for a prolonged period of time.

TABLE Lowering of the blood sugar level of rabbits, in percent,

after oral administration of 10 mg./kg. of N-[fi-G- chloro-quinolino 8-carboxamido-ethyl)benzenesulfonyl]-N'-cyclohexyl-urea After, hours:

The benzenesulfonyl-ureas of the present invention are preferably used for the manufacture of pharmaceutical preparations suitable for oral administration and for the lowering of the blood sugar level in the treatment of diabetes mellitus, and may be used as such or in the form of their physiologically tolerable salts or in the presence of substances which cause such salt formation. For the formation of salts, there may be used pharmaceutically aceptable bases, for example, alkaline agents such as alkali metalor alkaline earth metal hydroxides and alkali metal or alkaline earth metal carbonates or bicarbonates.

The pharmaceutical prepartions of the invention are preferably made up in the form of tablets, and as pharmaceutically suitable carriers there may be mentioned, for example, talc, starch, lactose, tragacanth and magnesium stearate.

A pharmaceutical preparation, for example, a tablet or a powder, containing the benzenesulfonyl-ureas of the invention as the active substance, with or without the aforementioned carriers, is advantageously brought into a suitable dosage unit form. The dose chosen should comply with the activity of the benzenesulfonyl-urea used and with the desired eflect. Advantageously, the dosage per unit amounts to about 0.5 to mg., preferably 2 to 10 mg., but considerably higher or lower dosage units may also be used, which, when required, are divided or multiplied prior to their administration.

The following examples illustrate the invention:

EXAMPLE 1 N- [4-(B-quinolino-8-carboxamido-ethyl)-benzenesulfonyl 1 -N'-cyclohexyl-urea 8.9 g. of 4-(,B-quinolino-8-carboxamido-ethyl)-benzenesulfonamide (M.P. 2l0-2l2 C., prepared from 4-(19- aminoethyl-benzenesulfonarnide and the mixed anhydride obtained from quinolino-S-carboxylio acid, triethylarnine and chloroforrnic acid methyl ester) were refluxed while stirring in 150 ml. of acetone with 5 g. of potassium carbonate. After addition of 3.1 g. of cycloheXyl-isocyanate, the whole was refluxed for 3 hours while stirring, the acetone was evaporated, the residue was treated with water and filtered. The filtrate was weakly acidified with dilute acetic acid, the precipitate was suction-filtered and recrystallized from water-ethanol. The N-[4-(fi-quinolino-8- carbox-amido-ethyl)-benzenesulfonyl] N cyclohexylurea obtained had a melting point of 184-185 C.

In an analogous manner there were obtained:

N-[4-(fl-quinolin0 8 carboxamidoethyl)-benzenesulfonyl]-N'-( l-methyl-cyclohexyl)-urea, M.P. 206-208" C. (from ethanol),

N-[4-(B-quinolino 8 carboxamidoethyl) 'benzenesulfony1]-N'-isobutyl-urea, M.P. 170-172" C. (from water-eth anol N-[4-(6-quinolino 8 earboxamidoethyl) -benzenesulfonyl]-N'-(A3-cyc1ohexenyl)-urea, M.P. ZOO-202 C. (from water-ethanol),

N-[4-(fl-quinolino 8 carboxamidoethyl) -benzenesulsu1f0nyl]-N-(4-ethyl-cyclohexyl)-urea, M.P. 192194 C. (from Water-ethanol),

N-[4-(fi-quinolino 8 carboxamidoethyl) benzenesulfonyl]-N'-(4-methyl-n3-cyclohexenyl)-urea, M.P. 171 C. (from water-ethanol) N-[4-( 8-quinolino 8 carboxatnidoethyl)-benzenesulfonyl]-N-(2,S endomethylene A3 cyclohexenyD- urea, M.P. 195-197 C. (from water-ethanol).

In an analogous rn'anner there were obtained from 4- (B-Z-methyl-quinolino-S-earboxamidoethyl) benzenesulfonamide, M.P. 199-202 C.:

N-{4-(fi-2-methyl quinolino 8 carboxamidoethyl)- benzenesulfonyl]-N'-cycloheXyl-urea, M.P. 168-171 C. (from water-ethanol),

N-[4-(B-2-methyl quinolino 8 carboXamidoethyD- benzensulfouyl] N' (4 methyl eycloheXyD-urea, M.P. 199-201 C. (from ethanol-water).

In an analogous manner there were obtained from 4 (fi 6 chloro quinolino 8 carboxamidoethyl)- benzenesulfonamide, M.P. 230232 C.:

N-[4-(B-6-chloro-quinolino 8 carboxamidoethyD-benzene-sulfonyl]-N-cyclohexyl-urea, M.P. 197-199 C.,

N-[4-(fi-fi-chloro-quinolino 8 carboXamidoethyD-benzenesulfonyl] N (4 methyl cyclohexyl) urea +1C H OH, M.P.124-127 C. (from ethanol-DMF),

N-[4-(fl-6-chloro-quinolino 8 carboxamidoethyU-benzenesulfonyl]-N'-n-butyl-urea, M.P. 1S1-153 C. (from ethanol-DMF),

N-[4-(B-6-chloro-quino1ino 8 carboxamidoethyD-benzenesulfonyl]-N'-(A3-cyel0hexeuyD-urea, M.P. 214- 216 C. (from ethanol-DMF).

In an analogous manner there were obtained from 4-(ii-6-bromo-quinolino 8 carboxarnidoethyl)-benzenesulfonarnide, M.P. 221-222 C.:

N-[4-(5-6-bromo-quinolino 8 carboxarnidoethyD-benzenesulfonyl]-N-cyclohexyl-urea, M.P. 187.5188.5 C. (from water-ethanol),

N-[4-(5-6-bromo-quinolino 8 carboxamidoethyD-benzenesulfonyl] N (A3 cyclohexenyl) urea, M.P. 201-203 C. (from ethanol-DMF),

6 N-E4-(B-6-brorno-quinolino 8 carboxamidoethyD-benzenesulfonyl]-N'-(4-methy1cyclohexyl)-urea, M.P. 123- 125 C. (from ethanol).

In an analogous manner there was obtained from 4-(fl-6-chloro quinolino 8 carboxamidopropy1)-benzenesulfonarnide, M.P. 215-217 C.:

N-[4-(fi-6-chloro-quinolino 8 carboxamido-propyl)- benzenesulfonyl]-N-cyclohexyl-urea, M.P. 197-199 C.

In an analogous manner there were obtained:

N-{4-(fi-6-chloroquinolino 8 carboxamidoethyl)-benzene-sulfonyl] N (2,5 endomethylene A3-cyelohexenyl)-urea, M.P. -192" C. (from ethanol),

N-[4-(fi-6-chloro-quinolino 8 carboxamidoethyD-benzenesulfonyl]-N-(4-ethylcyclohexyl)-urea, M.P. 166- 168 C. (from ethanol),

N-[4-(5-6-ch1oro-quinolino 8 carboxamidoethyD-benzenesulfonyl]-N-(4-chlorocyclohexyl)-urea, M.P. 192- 194 C. (from ethanol);

from 4-(5-5-methoxyquino1ino 8 carboxamidoethyD- benzenesulfonarnide, M.P. 201-202 C.:

N-[4-(5-5-methoxyquino1ino 8 carboxamidoethyD-benzenesultonyl]-N'-cyc1ohexyl-urea, M.P. 191-193 C. (from ethanol);

from 4-(u-methyl-fl-6-chloro-quinolino 8 carboxarnidoethyl)-benzenesulfonamide, M.P. 202204 C.:

N-[4-(e-methyl-fl-6-chloroquinolino 8 earboxamidoethyl)-benzenesu1fony1]-N'-cyclohexy1-urea, M.P. 198- 200 C. (from ethanol-DMF);

In an analogous manner there was obtained from 2-(6- chloro-quinolino 8 carboxarnido)-indan-5sulfonamide (M.P. 286-287.5 C.):

N-[2-(6-chloro quinolino 8 carboXamido)-indan-5- sulfonyl]-N-cyclohexyl-urea, M.P. 201202 C., (from ethanol/dimethylformamide) EXAMPLE 2 N- [4-(fl-quin0lino 8 carboxamido-ethyl)-benzenesulfonyl]-N'-cyclopentyl-urea N-[4-(fi -quinolino 8 carboxamidoethyl)-benzenesulfonyl]-N'-cycloheptyl-urea, M.P. 196-198" C. (from water-ethanol N-[4-(B-quinolino 8 carboxamidoethyl) benzenesulfonyl]-N'-4,4-dimethylcyclohexyl)-urea, M.P. 203-205 C. (from ethanol-DMF),

N-[4-(B-quinolino 8 carboxamidoethyl)-benzenesulfonyll-N' n propyl-urea, M.P. ISO-182 C. (from ethanol-DMF) N-[4-(fl-quinolino 8 carboxamidoethyl)-benzenesulfonyl]-N n hexyl-urea, M.P. 134-136 C. (from ethanol).

In an analogous manner there were obtained N- [4-(B-quinolino 8 carboxamidoethyl)-benzenesulfonyl]-N'-eyclooctyl-urea, M.P. 208-210 C. (from ethanol),

N- [4-(B-quinolino 8 carboxamidoethyl) benzenesulfonyl] -N'-( 3-methyl-cyclopenten (2)-yl)-urea, M.P. 191-193 C. (from ethanol-DMF),

from

4-(;3-'6-chloroquinolino 8 carboxamidoethyl)benzenesulfonyl-carboxarnido-methyl ester (M.P. 199-20l C.,

prepared from 4-(fi-6-chloro-quinolino 8 carboxamidoethyl)-benzenesulfonamide and chloroformic acid methyl ester):

N-[4-( 3-6-chloro-quinolino -8 carboxamidoethyl)-benzenesulfonyl]-N'-cyclopentyl-urea, M.P. 2042'06 C. (from ethanol-'DMF),

N-[4-(fl-6-chloro-quinolino 8 carboxamidoethyl)-benzenesulfonyl]-N-cycloheptyl-urea, M.P. 199-201 C. (from ethanol-DMF),

N-[4-(B-6-chloro-quinolino 8 carboxamidoethyl)-benzenesulfonyl] N (4-isopropylcyclohexyl)-urea, M.P. 171173 C. (from ethanol),

N-[4-(fi-'6-chloro-quinolino '8 carboXarnidoethyD-benzenesulfonyl] N-nortricyclyl-urea, M.P. 195197 C. (from ethanol),

N-[4-(B-6-chloro-quinolino 8 carboxamidoethyl)-benzenesulfonyl]-N'-(3-ethyl-cyclopentyl)-urea, M.P. 156- 158 C. (from methanol),

N-[4-(/3=6-chloro-quinolino 8 carboxamidoethyl)-benzenesulfonyl] -N-(cyclopenten- (2) -yl) -urea, M .P. 199- 200 C. (from methanol-DMF),

N-[4-(B-6-chloro-quinolino 8 carboxamidoethyl)-benzenesulfonyl]-N'-(cyclohepten-(2)-yl)-urea, M.P. 208- 210 C. (from methanol-DMF),

N-[4-(fi-6-chloro-quinolino 8 carboxamidoethyl)-benzenesulfonyl]-N'-(3,3-dimethyl-cyclopentyl)-urea, M.P. 152-155 C. (from methanol).

EXAMPLE 3 N- [4-( B-quinolino-8-carboxamido-ethyl)-benzenesulfo nyl] -N-cyclohexyl-urea A mixture of 28.56 g. of 4-(,3-quinolino-8-carboxamidoethyl)-benzenesulfonamide, 22.1 g. of potassium carbonate and 300 ml. of acetone was refluxed while stirring for 6 hours. Subsequently, 11.3 g. of cyclohexyl-isothiocyanate were added dropwise, and stirring was continued for 8 hours at boiling temperature. The precipitate was suction-lfiltered, introduced into dilute hydrochloric acid and the N-[4-(,B-quinolino-S-carboxamidoethyl)-benzenesulfonyl]-N'-cyclohexyl thiourea obtained was recrystallized from methanol and dioxan. M.P. 183- 184 C.

2 g. of N- [4- ,6-quinolino-8-carboxamido-ethyl)-benzenesulfonyl]-N'-cyclohexyl-thiourea were dissolved in 25 ml. of 1 N sodium hydroxide solution and 25 ml. of dioxan. Subsequently, 3 ml. of 30% hydrogen peroxide were added and the whole was heated on a steam bath for minutes. The mixture was diluted with water, filtered and acidified with dilute hydrochloric acid. The precipitate was suction-filtered and reprecipitated twice from dilute ammonia and dilute hydrochloric acid. The product was isolated and the N- [4-(B-quinolino-B-carboxamido-ethyl)-benzenesulfonyl] :N cyclohexyl-urea obtained was recrystallized from methanol; M.P. 186- 187 C.

EXAMPLE 4 ;N-[4-(fi-quinolino-8-carboxamido-ethyl)-benzenesulfonyl] -N-cyclohexyl-urea 4.96 g. of N-[4-(B-quinolino 8 carboxamido-ethyD- benzenesulfonyl]-N-cyclohexyl-thiourea were dissolved in 250 ml. of methanol and 40 ml. of dioxan. Subsequently, 2.16 g. of HgO were added and the whole was heated to the boil for 4 hours while stirring. The mixture was then concentrated and the N-[4-(B-quinolino-8-carboxamido-ethyl)-benzenesulfonyl] N cyclohexyl-iso- 8 urea methyl ether obtained was recrystallized from methanol. M.P. 138-140" C.

1 g. of isourea methyl ether, 30 ml. of dioxan and 30 ml. of 1 N sodium hydroxide solution were heated for 1 hour on a steam bath. Subsequently, the mixture was concentrated, stirred with dilute hydrochloric acid and reprecipitated twice from dilute ammonia and dilute hydrochloric acid. The N-[4-(ii-quinolino-8-carboxamidoethyl)-benzenesulfonyl]-N'-cyclohexyl-urea obtained was recrystallized from methanol; M.P. 184187 C.

EXAMPLE 5 N-[4-(,B-quinolino-8-carboxamido-ethyl)-benzenesulfonyl] -N'-cyclohexyl-urea A solution of 4.96 g. of N-[ 4-(B-quinolino-S-carboxamido-ethyl)-benzenesulfonyl] N cyclohexyl-thiourea. in ml. of dioxan was introduced into an excess solution of diazomethane and ether and the whole was allowed to stand overnight. Subsequently, the solution was concentrated and treated with ether. The N-[-(fi-quinolino- 8-carboxamido-ethyl)-benzenesulfonyl] N cyclohexylisothiourea methyl ether obtained had a melting point of 12l-l24 C.

1 g. of N-[4-(fl-quinolino-8-carboxamido-ethyl)-benzenesulfonyl]-N'-cyclohexyl-isothiourea methyl ether, 15 ml. of dioxan and 30 ml. of 1 N sodium hydroxide solution were heated for 1 hour on a steam bath. Subsequently, the solution was concentrated, stirred with dilute hydrochloric acid and reprecipitated twice from dilute ammonia and dilute hydrochloric acid. The N-[4-( 3- quinolino 8 carboxamido-ethyl)-benzenesulfonyl] N- cyclohexyl-urea obtained was recrystallized from methanol and had a melting point of 185-187 C.

in which X represents a hydrogen, chlorine or bromine atom, a

methoxy or methyl group,

R is

(a) alkyl having 3 to 6 carbon atoms,

(b) cycloalkyl having 5 to 8 ring carbon atoms, which is optionally substituted by 1 or 2 alkyl groups of up to 3 carbon atoms in total or by a chlorine atom,

(c) cycloalkenyl having 5 to 8 ring carbon atoms, which is optionally substituted by 1 or 2 alkyl groups of up to 3 carbon atoms in total,

(d) bicycloalkyl or bicycloalkenyl having 7 or 8 carbon atoms selected from the group consisting of endoalkylene-cyclohexyl, endoalkylene-cyclohexenyl, bicyclo[2.2.1]hept-2-ene-7-yl, 2,6-endomethylene-cycloheptyl, 7-norcananyl or spiro [2,4]- heptyl,

(e) nortricyclyl,

(f) spiro[2,4]-heptyl,

Z is hydrogen or an alkylene radical having 1 or 2 carbon atoms, which forms with Y a 5-membered ring, or salts thereof with pharmaceutically acceptable bases.

2. N-[4-(5-6-chloro-quinolino 8 carboxamidoethyl)- benzenesulfonyl]-N'-cyclohexyl-urea.

3. N- [4-(B-6-chlor0-quinolin0 8 carboxamidoethyD- benzenesulfonyl] -N- (4-methyl-cyclohexyl) -urea.

4. N- [4-(fl 6-chloro-quinolino 8 carboxamidoethyl)- benzenesulfonyl]-N'-cyclopentyl-urea.

5. N-[4- (p-6-chloro-quinolino 8 carboxamidoethyD- benzenesulfonyl]-N'-nortricyclyl-urea.

6. N-[4-(fl-6-bromoquinolino 8 carboxamidoethyD- OTHER REFERENCES Y Y Arzneim-Forsch., 1971, 21 2 pp. 204-208 (Ambrogi 7. N-[4-(B-6-brorno-quinolino 8 carboxamrdoethyD- et benzenesu1for1y1]-N'-(4-methyl-cyclohexy1)-u1ea.

5 LEON ZITVER, Primary Examiner References Cited 6. A. SCHWARTZ, Assistant Examiner UNITED STATES PATENTS Us Cl X R 3,655,756 4/1972 Weber et a1. 260-2-87 R X 424-258 

